来自《耶鲁大学开放课程：基础物理 第1集 第1集》

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  But this is not a spectator sport.
  但是你们不能只做观众
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  If you just watch me, you're going to learn nothing.
  光看我做 你们什么都学不到
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  It's like watching the U.S. Open
  就像你看美国网球公开赛
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  and thinking you're some kind of a player.
  想象自己是个选手
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  You will have to shed the tears
  你们也要激动到流泪
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  and you've got to bang your head on the wall
  懊悔到用脑袋撞墙
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  and go through your own private struggle.
  兴奋挣扎都要亲身经历
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  I cannot do that for you.
  我无法越俎代庖
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  I cannot even make it look hard
  我不会让这些问题变得看起来复杂
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  because I have memorized this problem from childhood, so
  因为这些问题我童年时就熟记于心
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  there is no way I can make this look difficult.
  我无法让它变得复杂
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  That's your job.
  那是你自己的事情